US4369490A
Expired / Lapsed
US
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Low-ripple power rectifier system
Assignee: Osram GmbH
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Filing: 1980-12-02
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Granted: 1983-01-18
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Expires: 2000-12-02
Abstract
Abstract To provide a power rectifier for connection to an a-c power network which has low ripple at the d-c output, and low harmonic content at the a-c side, particularly for feeding a d-c - a-c inverter frequency generator providing output in the audio or low supersonic range for supply of gas discharge or fluorescent lamps, a wave-shaping network is connected to the a-c side of a standard bridge rectifier unit such that the a-c power applied to the rectifier is of approximately trapezoidal or rectangular or square-wave shape; a suitable network is the combination of an inductance (D) and a storage capacitor(C1) in a T-network or in a series resonant circuit, in which the quadrature VA of the choke (D), at network frequency, is about 60% of the power to be supplied by the rectifier, with a capacitor (C1) in a T-network configuration of such value that the resonant frequency of the L/C circuit is about 2.2 to 2.6 times network frequency or equal to network frequency, when in a series resonant circuit. Splitting the inductance (D) into two winding portions, one in each one of the supply lines substantially reduces radio interference from a connected gas discharge lamp.
Inventors
- 👤 Frithjof Blum
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 23:03
CPC Classifications
H; H02; H02M; H02M1/00; H02M1/42; H02M1/4208; H02M1/4266; H02M1/14; H02M1/12; H02M1/126; H02M7/00; H02M7/02; H02M7/04; H02M7/05; Y; Y02; Y02B; Y02B70/00; Y02B70/10
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
215 words
Low-ripple low-harmonic reflecting rectifier system, particularly for coupling to an a-c power network and to receive a-c power input, and to provide d-c power output to a d-c semiconductor circuit, especially to supply a discharge lamp inverter circuit from a-c power terminals (Ph, Mp; 9, 10), having a-c network terminals; a rectifier circuit (1), having an input and an output; a filter capacitor (C2) connected across the d-c output of the rectifier circuit; and comprising, in accordance with the invention, an a-c wave-shaping and wave-transforming network means (D; C1) connected to receive the a-c voltage from the power network in sinusoidal wave shape and converting said sinusoidal wave shape to a wave shape which is approximately of trapezoidal shape including the combination of storage inductance means (D), and a storage capacitor (C1) connected to the a-c network terminals, the storage inductance (D) being connected between the network terminals and the input to the rectifier circuit in serial connected, and the storage capacitor (C1) being connected in parallel across the input to the rectifier circuit, and dimensioned and matched with respect to each other and the frequency of the voltage supplied by the a-c network in sinusoidal wave shape, to have a resonant frequency greater than twice network frequency but less than three times network frequency.
Claim 2
Dependent Claim
215 words
Low-ripple low-harmonic reflecting rectifier system, particularly for coupling to an a-c power network and to receive a-c power input, and to provide d-c power output to a d-c semiconductor circuit, especially to supply a discharge lamp inverter circuit from a-c power terminals (Ph, Mp; 9, 10), having a-c network terminals; a rectifier circuit (1), having an input and an output; a filter capacitor (C2) connected across the d-c output of the rectifier circuit; and comprising, in accordance with the invention, an a-c wave-shaping and wave-transforming network means (D; C1) connected to receive the a-c voltage from the power network in sinusoidal wave shape and converting said sinusoidal wave shape to a wave shape which is approximately of trapezoidal shape including the combination of storage inductance means (D), and a storage capacitor (C1) connected to the a-c network terminals, the storage inductance (D) being connected between the network terminals and the input to the rectifier circuit in serial connected, and the storage capacitor (C1) being connected in parallel across the input to the rectifier circuit, and dimensioned and matched with respect to each other and the frequency of the voltage supplied by the a-c network in sinusoidal wave shape, to have a resonant frequency greater than twice network frequency but less than three times network frequency.
Claim 3
Dependent Claim
37 words
Rectifier system according to claim 1, wherein (FIGS. 3, 5) the network is a single-phase network having two network terminals, and the storage inductance is connected in the "hot" or ungrounded or phase line of said network.
Claim 4
Dependent Claim
41 words
Rectifier system according to claim 1, wherein (FIGS. 7a, 7b; 9a, 9b) the network is a single-phase network, and the storage inductance (D) comprises two inductance units, one each being connected in one of the supply lines of the single-phase network.
Claim 5
Dependent Claim
40 words
Rectifier system according to claim 3, wherein (FIGS. 7a, 9a) the inductance units comprise a common core and two separate inductance windings would on said core, one winding, each, being connected in one of said supply lines of the network.
Claim 6
Dependent Claim
33 words
Rectifier system according to claim 3, wherein (FIGS. 7b, 9b) the inductance units comprise separate cores and separate inductance windings wound on the respectively separate cores and connected in the respective supply lines.
Claim 7
Dependent Claim
48 words
Rectifier system according to claim 1, wherein (FIGS. 10, 11) the network is a three-phase network having at least three connecting lines, in which the storage inductance (D) comprises a separate inductance unit (73, 74, 75; 80, 81, 82) connected in respective supply lines of the three-phase network.
Claim 8
Dependent Claim
49 words
Rectifier system according to claim 1, wherein (FIG. 10) the rectifier circuit is a bridge rectifier circuit having three input terminals (62, 63, 64); and wherein the storage capacitor (C1) comprises three capacitor units (76, 77, 78) connected, each, across two respectively different input terminals of the rectifier circuit.
Claim 9
Dependent Claim
30 words
Rectifier system according to claim 1, wherein the resonant frequency of the storage inductance (D) and the storage capacitor (C1) combination is between about 2.2 to 2.6 times network frequency.
Claim 10
Dependent Claim
37 words
Rectifier system according to claim 1, wherein the impedance of the inductance (D) at network frequency is selected to have an apparent power of about 60% of the actual effective power to be supplied by said system.
Claim 11
Dependent Claim
48 words
Rectifier system according to claim 1, wherein the capacity of the filter capacitor (C2) is in the order of at least 0.15 μF/watt of the power to be supplied by the rectifier circuit at a supply voltage of 220 V nominal and a network frequency of 50 Hz.
Claim 12
Dependent Claim
28 words
Rectifier system according to claim 10, wherein the capacity of the filter capacitor (C2) is in the order of about 0.3 μF/watt of power supplied by the system.
Claim 13
Dependent Claim
46 words
Rectifier system according to claim 1, wherein the capacity of the filter capacitor (C2) is in the order of at least 0.5 μF/watt of the power supplied by the rectifier circuit at a supply voltage of 110 V nominal and a network frequency of 60 Hz.
Claim 14
Dependent Claim
28 words
Rectifier system according to claim 12, wherein the capacity of the filter capacitor (C2) is in the order of about 1.0 μF/watt of power supplied by the system.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-01-17 | 1986-07-19 | 1987-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-01-17 | 1990-07-19 | 1991-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-01-17 | 1994-07-19 | 1995-01-18 | $7700.00 | Window Closed / Lapsed |